Houjin Exaxxion

Houichi Kano, the Grandson of world famous inventor Hosuke Kano, is a student at Houwa High School in Musashino City. At the tenth anniversary of the first contact with the Riofaldians, the unveiling of an Elevator Ship designed for orbital transport between the Riofaldian home world and Earth is about to take place. However, this was just a ploy to take control of the Earth using their advanced technology and large Riofaldian work force on Earth to their advantage. It is now up to Houichi, with the help of Housuke, his school friend Akane and Isaka, to stop them and save Earth.

There is plenty of mecha mega-robot action, state of the art gunsuits, sexy shape-shifting androids and the reason why the manga is called Cannon God...